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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1060736	Seattle Genetics Inc	SGEN	Biological Products, (No Disgnostic Substances) (2836)	911874389

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1167496	B Clay Siegall	21823 30Th Drive Se Bothell WA 98021	President And Ceo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2012-12-03	8,250	$3.30	1,179,211	No	4	M	Direct
Common Stock	Disposition	2012-12-03	8,250	$25.19	1,170,961	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2012-12-03	8,250	$0.00	8,250	$3.30

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
4,249	2004-01-31	2013-01-31	No	4	M	Direct

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Dr. Siegall and described in a Form 8-K filed on June 15, 2012.
25.1851 represents an average price per share for the shares sold on 12/03/2012. The sell price for shares sold on this day ranged from $24.97 to $25.43.
Amount of securities beneficially owned following reported transactions includes 152,387 Restricted Stock Units subject to vesting.
25% of the shares vested on 1/31/04. The remainder vested monthly thereafter until all shares were fully vested on 1/31/07.